Satellite constellation is envisioned as an important approach to enhancing the capability of existing networks. Technologies such as Network Function Virtualization (NFV) and Service Function Chain (SFC) have been proposed to make satellites much more tolerant to different kinds of service requests. Owing to Software-Defined Networks (SDN), satellite constellations can be managed in a more flexible manner. However, due to the high variability of constellation and multi-types of Virtual Network Functions (VNFs), it becomes a major challenge to select appropriate instances of VNFs to concatenate for routing when orchestrating resources to map SFC requests. In this paper, we investigate SFC Mapping Problem (SFC-MP) in a dynamically changing logical segmented network to provide stable communication service. We formulate the problem as a Binary Integer Programming (BIP) model. In addition, we propose a new Continuous Logical Segmented Network Resource Aware Routing (LSNRAR-Continuous) algorithm for SFC requests routing to achieve network load balancing and reduce the impact of VNF migration on services. Simulation results show that the algorithm can effectively solve the SFC-MP problem, and the proposed algorithm has higher performance in terms of average delay, mapping cost and service stability compared with existing literature algorithms.
Dynamic Mapping Service Function Chains in a Logical Segmented LEO Constellation
2023-10-10
3757007 byte
Aufsatz (Konferenz)
Elektronische Ressource
Englisch
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